The Apple Watch will ship in April, according to Apple CEO Tim Cook who discussed the watch on the company's first quarter earnings call.

"Development for Apple Watch is right on schedule and we expect to begin shipping in April," Cook said. "Developers are hard at work on apps, notifications, and information summaries that we call Glances, all designed specifically for the Watch's user interface."

Most reports until now have expected the watch to come out in March, but later in the call Cook added that they had always expected the watch to come out around April.

"And just to clarify, what we had been saying was 'early 2015', and we sort of look at the year and think of early as the first four months, mid is the next four months and late is the final four months," he said. "And so to us it's sort of within the range and it’s basically when we thought." 

Cook first announced the Apple Watch in September 2014. He said at the time that the Apple Watch will track movement through a built-in accelerometer and heart rate through optical sensors in the back of the device. It will extrapolate further data from the GPS and WiFi radios on the user’s iPhone, which will be required to use many of the features of the device.

But, since the initial announcement, there have been very few rumors released about the watch.

A few weeks ago, leaked screenshots of Apple’s companion iPhone app for the wristworn device offered a glimpse at how the Apple Watch will handle activity and fitness. In the app’s activity section, Apple Watch owners will be able to activate “stand reminders”. When the setting is turned on, the Watch will notify a user if they’ve been sitting for the first 50 minutes of an hour. Users can also set an interval to receive progress reminders every four, six, or eight hours. The Watch can also notify users if they’ve reached their standing goal, move goal, and exercise goal as well as a milestone or personal best.

And recently, 9to5Mac reported that a source revealed details about the Apple Watch’s battery life. They wrote that the battery will last for 2.5 to 3.5 hours of continuous app use (2.5 for heavy app use and 3.5 for standard app use). Kept purely in passive mode, the watch will last for 3 days, or 4 days in sleep mode. The most likely use pattern is a combination of active/passive use, which would yield a battery life of 19 hours. Notably, if all the wearer is using is the Fitness app, the battery will run out after 4 hours of active use.